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Bit-perfect
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Bit-perfect audio/video does not perform any digital signal processing (DSP) such as channel matrixing, filters and equalizing and does not do any resampling or sample rate conversion (such as upsampling or downsampling). In audio this means that the digital output from the computer sound card is the same as the digital output from the stored audio file. Unaltered passthrough. The data stream (audio/video) will remain pure and untouched and be fed directly without altering it. Bit-perfect audio is often desired by audiophiles. In case of error correction it might apply error concealment through interpolation which results in the result not being bit-perfect. Poor device drivers often alter the data, resulting in it making not bit-perfect. This is especially true for device drivers used in consumer-grade sound cards. Bit-perfect is good when sending the data output digitally (such as via S/PDIF) to an external digital-to-analog converter (DAC). |
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